Hypodermic syringe



A. L. OSTROV.

HYPODERMIC SYRINGE.

APPLiCATlON FILED DEC.1I. 1919.

Patented Jan. 3, 19220 user so STATES PATENT osrica v ABRAM LIEMAN OSTROV, OF LLANDRINDOD WELLS, WALES.

n'xronnnmrc svnmon I To all whom it may concern:

Be it known that I, ABRAM LIPMAN/ Os-v 'rnov, a Russian subject, residing at Llandrindod Wells, Wales, have invented a certaim new and useful Improvement in Hypodermic Syringes, of which the following is a specification.

This invention relates to hypodermic syringes and moreparticularly to the nozzleportion thereof which carries the hypodermic needle, and to the needle itself.

The invention has for its object to provide certain features of improvement in the construction of these parts of the syringe.

The improved syringe of myinvention comprises a nozzle constructed in two distinct portions, one of which, hereinafter termed the needle. socket, is adapted to be attached to the nozzle projection on the barrel of the syringe. The other portion of the nozzle, hereinafter termed the needle holder, is arranged to be attached to the needle socket and serves to support and retain the hypodermic needle in position.

According to the principal feature of the invention the needle socket is formed with an axial screw threaded passage divided transversely into two portions of different internal diameters. One of these portions, viz., that adapted to fit on to the nozzle projection of the syringe, has an internal diameter substantially less than that of the head of the needle. The other portion, 'viz., that adapted to receive the needle holder, is of substantially greater diameter than the head of the needle.

According to a further feature of the invention, the head of the needle instead of being located at the end of the needle as has hitherto been customary, so that its bearing surface is level with the end of the needle, is set back from the end to such an extent that the end of the tubular needle .projects beyond the bearing surface of the head when the latter is gripped in position between the two portions of the nozzle.

The invention is illustrated in the accompanying drawing, of which Figure 1 is a view in longitudinal section showing one form of nozzle embodying my invention with the needle in position therein.

Figure 2 is a similar view of a modified shape of nozzle.

Figure 3 being a perspective view of one form of my improved needle.

Referring now to Figures 1 and 2, the nee- Specificationof Letters Patent.

the needle.

the shank 4 in any preferred way, so for Patented Jan. 3, 1922.

Application filed December 11, 1919. Serial No. 344,053.

dle socket is indicated at 1 and the'needle holder at 2, the needle 3 being of the usual form comprising atubular shank 4 with a projecting circular head 5 at the end of the needle remote from the point thereof.

The axial passage in the needle socket 1 is screwthreaded as shown and is divided into two portions one of which, viz., that indicated at 6 has an internal diameter substantially less than the diameter of the head 5 of the needle 3. The other portion of the axial passage, viz., that indicated at 7 is of substantially greater diameter than the head 5.

"When the socket 1 and the holder 2 are assembled the head 5 of the needle is gripped bet-ween the inner face of the needle holder 2 and the shoulder in the needle socket 1 separating the portions 6 and 7 ofthe socket of different diameter. Owing however to the relative internal dimensions of the two portions 6 and 7 of the needle socket 1, the head 5 of the needle 3 even when compressed and spread laterally to a slight extent cannot engage with the threads of the screw and may therefore be easily removed when the socket 1 and the holder 2 are taken apart.

The forms shown in Figures 1 and 2 differ merely in external configuration and in each form a protecting sheath indicated at 9 is provided covering a portion of the needle extending beyond the nozzle proper.

Referring now to Figure 3, the improved needle comprises a tubular shank 4 provided with a head 5. The latter consists of a conical ortion 10 the base of the cone beingexten ed to form an annular flange or rim 11. In'order to provide increased security of attachment of the needle to the head the base of the conical portion is centrally extended to form a cylindrical projection 12 the outer end of which is approximately level with the edge of the flange or rim 11. The end 8 of the shank 4 is extended beyond the level of the flange or rim 11 so that when the flange 11 is compressed and gripped between the socket 1 and the holder 2 of the nozzle, the end 8 of the needle projects clearly within the axial passage 6.

- The advantage of this arrangement is that any extension or deformation of the head 5 owing to its being tightly gripped in the socket 1 of the syringe, cannot cause a portion of the head 5 to overlap the bore of the needle 3 and thus artly or completely choke The ead 5 may be securedto instance by a ressing operation, the end 8 of the shank eing grooved, roughened or a screw thread formed thereon if desired in order to insure satisfactory attachment oi thehead of the needle.

Various modifications in the constructional details above described may evidently be made without exceeding thescope of the invention.

Having now described my invention, what I claim as new and desireto secure by Letters Patent is 1. In a hypodermic syringe, the combination of a tubular needle having a projecting circular head set back from the end of said needle, a needle socket having a screw threaded axial passage therein divided transversely into two portions of different internal diameters, a shoulder separating said portions and against which the head of said needle bears, and a needle holder adapted to enter said (portion of larger diameter for securing sai needle in position therein.

2. n ahypodermic syringe, the combination of a needle socket having an axial screw threaded passage divided transversely into two portions of different diameters, a shoulder separating said rtions of different diamete'rs,-a screw t readed needle holder adapted to be accommodated in said portion of larger diameter, a tubular needle, and a pro'ectin circular head therefor which is set ack mm the extreme end of said needle and is of substantially larger diameter than the portion of the passage in the needle socket of smaller diameter and substantially less than the portion of the passage in the needle socket of larger diameter.

In witness whereof I have hereunto set my hand.

A. L. OSTROV. 

